Deep-well rotary drill



. 1,524,776 F. w. BOLAND ET AE DEEP WELL RQTARY DRILL "Filed 00T.. 8, 1923 [NVENTRS Frederz'ckWBoZand Andrew 6'761127 A TTORNE Y.

Feb. 3. 1925, 1,524,776

F 1w. BOLAND ET AL DEEP WELL ROTARY DRILL 105 6 Filed Oct. 8, 192,55 5 Sheets-Sheet 2 38 10 "V58 o '/12 w IZ 7 M my :,/13

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Feb. 3. 1925.

F. W. BGLAND ET AL DEEP WELL ROTARY DRILL 3 Sheets-Sheet 3 Filed oct. 8, 1925 INVENToRs Frederick WBaland B Andrew Ura y ATTORNEY.

Patented Feb. 3, 1925.

UNITED STATES'PATENT oFFicE.

FREDERICK W. BOLAND #ND ANDREW CRAIG, OF LOS ANGELES, CALIFORNIA.

DEEP-WELL ROTARY DRILL.

Application led October 8, 1923. Serial No. 667,129.

To all whoml it may concern.' e

Be it known that we, FREDERICK lV. ROLAND and ANDREW CRAIG, citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have jointly invented new and useful Improvements in Deep-fell Rotary Drills, of which thc following is a specilication.

Our invention relates to deep well rotary drilling apparatus. I

In rotary oil well drilling much time is lost in lowering drill pipe of considerable length into the well and in lifting said pipe out of the well and drill pipe of any length involves considerable expense. Moreover, the twisting and breaking of drill pipe is another serious diliiculty and expense in rotary drill practice.

The general object of our invention is to provide a rotary drill by means of which the above enumerated diiiculties may be overcome.

A more particular object is to provide a self-contained rotary power drill plant which may be readily lowered into the bottom of a well for drilling er lifted out of the well when desired.

Other objects and advantages will appear hereinafter and while we show herewith and will describe a preferred form of construction, we desire to be understood that we do not limit our invention to such preferred form but that various changes and adaptations may be made therein without departing from the spirit of our invention as hereinafter claimed.

Referring to the drawings Fig. 1 Vis an elevation of our well drilling apparatus shown in operative position in the bottom of a well.-

Fig. 2 is an axial vertical longitudinal section of our drilling apparatus.

Fig. 3 is an elevation of the bit of our drilling apparatus.

Fig. 4 is an enlarged horizontal section of our drilling apparatus taken on line 4-4 of Fig. 2.

Fig. 5 is an enlarged horizontal section taken on line 5-5 of Fig. 2.

Fig. 6 is an elevation partly in section of the corin bit.

b Fig. 7 is a bottom plan view of the pilot Fig. 8 is a vertical sectional view of the upper end of my drilling apparatus.

Fig. 0 is a plan view of the drilling bit.

Fig. 10 is a side view of one of the bit studs. j

Fig. 11 is a longitudinal section through the swivel joint which connects the water hose to the drill pipe.

Fig. 12 is anenlarged view of the cutting cnd of the Corin V bit.

Our rotary drill plant is contained within a cylindrical casing 1, which may be made in three superimposed sections 2, 8 and 4 joined together by collars 5 and 6. To the outside of the casing 1 are secured bars 7 extending longitudinally of and outstanding from said casing so as to embed themselves in the earth at the sides of the well to prevent turning of the casing during the drilling operation of the apparatus.

Our drill plane includes a cylindrical shell 10 in which the working parts of the plant are mounted, which shell is secured in the lower casing section 2, by means of screw bolts 11 and 12 extending through the lower and upper ends` respectively of said casing section and shell.

A hollow drill shaft 13 extends axially through the casing 1 and shell 10 and is journaled on end thrust ball bearings 14 and 15 respectively in the lower and upper ends of the shell l0. prises a. transverse wall 16 in the lower part of Shell 10, a bearing member 17 and alls 18 resting in a race 19 in the upper face of said wall and in a race 20 in the lower face of said member 17.

The wall 16 has a central opening 21 through which extends the shaft 13. The shaft 13 has an external thread 22 which is engaged b v an internal thread 23 on member 17. A lock nut 24 screws on shaft thread 22 against said hearing incinher 22 to lock said member in proper position on the shaft 13.

The bearing 15 comprises bearingr incinbers 25 and 26 and balls 27 resting in races 28 and 29 in the lower and upper faces of said members. The member 25 is formed on a transverse wall 30 in the upper end of shell 10. The member 26 has an internal thread 31 which engages an external thread 32 on the drill shaft 13. A lock nut 33 screws on the shaft thread 32 against the The bearing 14 co1n member 26 for locking said member in its proper position on the shaft. A transverse wall extends across the lower end of the shell 10 below the wall 16, forming an oil chamber 36 betweeny said walls.

A stuffing box 37 is formed on the wall 35 surrounding the drill shaft 13. A stall'- ing box 38 is formed on the uppei wall 30 surrounding the upper portion of\ the shaft 13.L

A compressed air motor 40 is mounted in the shell 10 immediately below the bearing 15 which motor includes a plurality of reciprocating engines 41 preferably four in number, spaced equidistant apart around the shaft 13.

Each engine comprises a cylinder 42, a valve chest43 formed integral with said cylinder, a piston rod 44, connecting rod 45, a. 'crank shaft 46, a crank 47 on said shaft, to which said connecting rod is connected, an eccentric 48 on said shaft, anA

eccentric strap 49 surrounding said eccentric, and an eccentric rod 50 connected to said eccentric and leading into said valve chest 43 and connected to the valve (not shown) inside said valve chest.

On the valve chest is formed a flange 51 which is bolted by bolts 52 to the inside of .the shell 10. On the inside of said shell is formed a frame 53 comprising a square encircling member 54, surrounding the shaft 13, and arms 55 extending radially from the corners of said members 54 and connected to the inside of shell 10. The crank shaft 46 of each engine is journaled at its outer end in a bearing 56 in the shell 10 and at its inner end in a bearing 57 on the frame member 54. Compressed air is supplied to the engines 41 through a. pipe 58 extending downwardly through the casing 1 and through wall 30 into the shell 10. which pipe is connected at its lower end to the motor inlet manifold 59.

The shaft 13 is driven by the motor throufrh a train of reducing gearing 60 comprising bevel pinions 61, bevel gear 62 meshing with said 'pinions, bevel pinions 63, bevel gears 64 in mesh with bevel pinion 63, bevel pinions 65, and bevel gear 66 meshing with said bevel pinions 65. The bevel pinions 61 are secured on the crank shafts 46 respectively. The bevel gear 62 loosely surrounds the shaft 13 and is mounted on ball bearing 67, the lower member 68 of which bearing is supported on arms 69 extending inwardly ,from the wall of shell 10. The bevel pinion 63 is formed integral with and-depends from the bevel gear 62, said pinion also loosely surrounding the shaft 13.

Each bevel gear 64 and its companion bevel pinion are secured on a shaft 70, journaled in a bearing 71 on a. bar k72 extendlng horizontally and joined at its ends to the shell 10.

studs 7 9 projecting outwardly from the periphery of said head. The inner ends 0f said studs have threads 80 which seat in threaded sockets 81 in the head 78, and hexagonal flanges 82 are formed on said studs to receive a wrench whereby said threaded ends of said studs are` screwed into .said threaded sockets until said anges enga e the surface of said head. The outer en s of the studs 79 are pointed as at 83 for cutting the earth in the well. The head 78 is formed with a plurality of spiral grooves 84 through which the cut earth in the bottom of the well passes the bit 76 upwardly as the bit descends.

The head 78 has a threaded socket 85 in its upper end to receive the lower threaded end 86 of the drill shaft 13. A hollow stem 87 connects the main bit 76 and the pilot bit 77, the upper end 88 of said Stem being externally threaded to seat in a threaded socket 89 in the lower end of the bit head 78, and the lower end of said stem being internally threaded as at 90 to receive a threaded shank 91 onthe upper end of said pilot bit. The head 78 has an axial bore 92 communicating with the sockets 85 and 89 and the hollow shaft 13 and hollow stem 87.

The pilot bit 77 has an axial bore 93 leading downwardly through the shank 91 and into the body of the bit and communicating with threeA outlets 94 leading outwardly through the periphery of the bit at three equi-distantly spaced points.

A coring tube 100 ma y be connected to the bit 76 upon removal of tl ie pilot bit stem 87, the upper end 101 of sain tube being threaded to seat in the threaded socket 89. The lower end of said tube is formed with outtin teeth 102, and said lower end is enlarged s ightly as at 103 to prevent friction of the tube in the bore which it cuts, while the lower end of the bore of said tube is reduced slightly in diameter as at 104 to hold a sample core of earth in the tube when lifted out of the well.

A hose'105 extends downwardly into the casing 1 and `is connected to the upper end of the drill shaft 13 by a swivel coupling 106 so that said shaft may rotate with relation to said hose.

A hollow head 110 fits in the upper end of casing section 4 and is secured therein by rivets 111.. The upper end of said head 1s arched and formed with an eye 112 through 4 which extends a cable 113 which is secured to said eye for lowering our drilling apparatus into the well and for liftn the same outof the well. The head 110 1s provided with Openings 114 and 115 through which extend the hose 105 and tube 58 into the easing l.

Water is supplied through the hose 105 to the drill shaft 13 and through the bit bore 92, stem 87, bore 93 and outlets-94 into the bottom of the Well to soften the earth so that the ilot bit 77 and main bit 76 will out the cart easily.

The o eration of our invention will be obvious 0111 the disclosure.

Ve claim as our invention:

Apparatus :1s disclosed comprising a, casing, a, drill shaft journaled Within said casing, a bit on the lower end of said shaft below said easing, a motor mounted within said casing, a crank shaft journaled Within said casing and driven by said motor, a bevel pinion on said crank shaft, a bevel gear and a bevel pinion formed integral with each other and loosely mounted on said drill shaft, said bevel gear meshing with said lirst bevel pinion, a shaft, a second bevel gear and a` third FREDERICK W. BOLAND. ANDRE7 CRAIG. 

